Silicon-29 Solid-State MAS NMR Investigation of Selective Area Laser Deposition Silicon Carbide Material
| Autor: | Harris L. Marcus, Shay Harrison, Kevin J. Jakubenas, Xiangqun Xie |
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| Rok vydání: | 2004 |
| Předmět: |
Diffraction
Materials science Magic angle Silicon Analytical chemistry chemistry.chemical_element Nuclear magnetic resonance spectroscopy Microstructure NMR spectra database Crystallography chemistry.chemical_compound chemistry Materials Chemistry Ceramics and Composites Magic angle spinning Silicon carbide |
| Zdroj: | Journal of the American Ceramic Society. 82:3221-3224 |
| ISSN: | 1551-2916 0002-7820 |
| DOI: | 10.1111/j.1151-2916.1999.tb02227.x |
| Popis: | The microstructure of silicon carbide fabricated from the gas-phase-based, laser-driven selective area laser deposition (SALD) process has been characterized by X-ray diffraction and solid-state 29Si NMR techniques with magic angle spinning (MAS). X-ray patterns reveal the characteristic spectrum of pure s, cubic silicon carbide polytype while NMR shows a s-SiC pattern with additional peaks. To determine the source of the extra peaks, a comparative evaluation of commercially available silicon carbide powders, both alpha- and s-SiC, was undertaken with NMR. Spin-lattice relaxation time measurements (T1) were also carried out to determine the polytype morphology of the SALD deposit. The results showed an NMR spectrum that appears to be a combination of alpha and s polytypes. Microtwinning is advanced as a possible explanation for this phenomenon. |
| Databáze: | OpenAIRE |
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